Spring



Patented Apr. 3, 1923 UNITED STATES.

AREND KLAASSE, 0F JACKSON, MICHIGAN.

SPRING.

Application filed April 17, 1922. Serial No. 553,480.

To all w/Lom l? may concern.'

Be it known that I, AREND KLAAssE, a citizen of the United States, residing at Jackson, in the county of Jackson and State of Michigan, have invented new and useful Improvements in Springs, of which the following is a specification.

The present invention relates to springs, such as are employed for cushioning the seats of automobiles and the like; and its object is to provide an improved longitudinal1y-resilient helical spring one portion of which may be compressed with less force than another portion thereof.

This and any other objects hereinafter appearing are attained by, and the invention finds preferable embodiment in, the spring structures hereinafter particularly described and illustrated by the accompanying drawings, in which Figure 1 is a side view of a helical spring; and

Figure 2 is a like view of a modified form thereof.

It is desirable that seats for automobiles and the like be so cushioned as to be more l easily compressed for an initial portion of their compressingr operation than for a succeeding` portion thereof. This is particularly desirable in order' that the springable seats, which havebeen suddenly compressed by the vehicles wheels dropping into a rut or depression in the road, may be cushioned in their recoil from such sudden co1npression.

y rlhis end has been accomplished in various waysz- Helical springs for such seats have been provided whose upper portion is made of spring wire of less gage or more resilient in quality than the spring wire composing the lower portion of the spring; and spring wire of the same gage or of the same resilient quality has been employed throughout the helical spring, the coils thereof adjacent the springs lower end being further apart and thus not so easily compressible as the coils adjacent the springs upper end.

I attain the desired'end by forming my helical spring of wire of the same gage and resiliency throughout, but the coils adjacent the upper end of the spring*which coils successively increase in diameter toward said end--are of greater diameter than the coils corresponding in position thereto respectively which are adjacent the lower end of the spring, these lower coils increasing successively in diameter toward the springs lower end.

The two views show this construction: In Figure 1 the longitudinallyresilient helical spring has upper coils 1, 2, 3 which successively increase in diameter toward the springs upper end, and lower coils 4, 5, 6 which successively increase in diameter toward the springs lower end, coil 1 being of greater diameter than coil 4, coil 2 o-f greater diameter than coil 5, and coil 3 of greater diameter than coil 6. It is manifest that a coil of greater diameter is more easily compressed than a coil of less diameter, and that therefore the coils 1, 2 and 3 composing the upper part of the spring will be compressed more easily and therefore sooner than the coils 4, 5, 6 composing the springs lower part.

In Figure 2 the same feature is shown, and in addition thereto the following: The lower coils 41, 51, 61 are of less diameter than the upper coils 11, 21, 31, and therefore the spring may be compressed to such a degree that all its coils may lie spirally-disposed, flat in one plane.

I claim:

1. A longitudinally-resilient helical spring whose coils adjacent the respective ends thereof successively increase in diameter toward said ends, the coils adjacent one end of the spring being of greater diameter than the coils corresponding in position thereto respectively 'adjacent the other end of the spring.

2. A longitudinally-resilient helical spring whose coils adjacent the respective ends thereof successivelyv increase in diameter toward said ends, the coils adjacent one end of the spring being of greater diameter than the coils adjacent the other end of the spring and so diametrically related thereto that all the coils may lie spirally disposed flat in one plane.

' 3. Alongitudinally-resilient helical spring, all of whose coils on one side of the middle of the spring are of greater diameter than any of the coils on the other side of the vmiddle of the spring.

In testimony whereof I have hereunto set my hand at Grand Rapids, Michigan, this 15th day of April, 1922,.

` AREND KLAAssE. 

